Singer Renee Geyer badly damaged a Melbourne optometrist shop yesterday after she crashed her car through the front window.

Police would not confirm the driver's identity but said a 57-year-old woman from Elwood hit at least one other car while reversing from a parking spot at 6:30pm (AEDT) before smashing into the shop front.

It is thought she put her foot on the accelerator instead of the brake.

Police said the woman was breath-tested and their inquiries are continuing.

No charges have yet been laid.

Shop owner Jo Twaddell says she is just glad no-one was hurt.

"It's probably very lucky that it was Melbourne Cup day, otherwise we probably would have been in the shop," she said.

"It's very lucky that we weren't."

Ms Twaddell says she rushed to the shop after receiving a call from their security company.

"Then to see the fire, the ambulance, the police, everyone here was quite shocking," she said.

Ms Twaddell says it is just an unfortunate accident.

"[Geyer is a] local, but it's unfortunate for it to happen to anybody. But it could have been a lot worse."

Jazz and soul singer Geyer, 57, was diagnosed with breast cancer in 2009.